What is the Laplace transform of sin t?

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1. Reciprocating screens are normally inclined at an angle of 5� with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the
Options
A. light metal powder down upto 4 meshsize.
B. dry chemicals.
C. heavy tonnages of rocks or gravel.
D. powdered food & granular materials.

2. Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for
Options
A. British standard screens.
B. German standard screens (DIN 1171) etc.
C. American standard screens (ASTM and Tyler standard screens).
D. all (a), (b) and (c).

4. Pick out the wrong statement.
Options
A. Cummulative analysis for determining surface area is preferred over differential analysis, because of the assumption that "all particles in a simple fraction equal in size" is not needed for cummulative anslysis unlike differential anlaysis.
B. A gate diagram is a plot of cummulative percent by weight undersize vs. the reciprocal of diameter, in which the area beneath the curve represents the surface.
C. Capacity of crusher in choke feeding is increased.
D. Rolling of pebbles/balls from top to bottom of the heap in tumbling mills is called 'cascading and throwing of the balls through the air to the toe of the heap is called 'cataracting'.

5. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers'?
Options
A. Bucket conveyor
B. Flight conveyor
C. Screw conveyor
D. Both (b) and (c)

6. Which of the following is not a mathematical method for evaluation of profitability of a chemical process plant?
Options
A. Cash reserve.
B. Rate of return on investment.
C. Payout period.
D. Discounted cash flow based on full life performance.

7. Pick out the wrong statement pertaining to the decomposition of PCl₅ represented by, PCl₅ ⇌ PCl₃ + Cl₂.Degree of dissociation of PCl₅ will
Options
A. decrease on addition of Cl₂.
B. increase on addition of an inert gas at constant pressure.
C. decrease on increasing the pressure of the system.
D. none of these

8. Pick out the correct statement
Options
A. Reactions with high activation energies are very temperature sensitive.
B. Chemical equilibrium is a static state.
C. A photochemical reaction is catalysed by light.
D. A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction.

9. At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied:
P_o = ?/?N³ D⁵ : Power number
Re = ? N D²/?: Reynold's number
N is the impeller rotational speed, and D is the impeller diameter.
Options
A. P_o ? Re^-1.0
B. P_o ? Re^0.0
C. P_o ? Re^0.5
D. P_o ? Re^1.0

10. Bubble cap tray is the most commonly used tray in large distillation column, because
Options
A. of its flexibility and nearly constant efficiency under varying conditions of operation.
B. it incurs less pressure drop as compared to any other try designed for the same duty.
C. it eliminates the foaming and entrain-ment tendency during operation.
D. none of these.

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